Is this a pretty good gaming build?

Solution
There is no problem buying a SSD early if you were planning to add 1TB hard drive later on.
Here a suggestion:
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.49 @ OutletPC)
Motherboard: ASRock FM2A88X Extreme4+ ATX FM2+ Motherboard ($88.98 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1600 Memory ($85.98 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($79.00 @ B&H)
Video Card: EVGA GeForce GTX 750 1GB Video Card ($99.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply:...

Poprin

Honorable
Dec 13, 2012
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Well the board has a radeon based integrated solution on it, I have that board... the onboard graphics controller is very weak. It will just about handle HD video playback but you can't play games on it.

TBH if you are building a microATX gaming machine AM3 is not the way to go, because they are trying to phase out that socket the microATX AM3 board that are available only use the 760g chipset which is a pile of pants. It has no native support for USB3 or SATA3 and the USB3 controller on that board is a bolt on asmedia one with no front USB3 headers only rear.

If I was going microATX and AMD I would go for an FM2 socket.
 


I didn't know on-board graphics were still a thing o_O

I agree, for micro-ATX you should either go for FM2+ or LGA1150.
 
There is no problem buying a SSD early if you were planning to add 1TB hard drive later on.
Here a suggestion:
PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.49 @ OutletPC)
Motherboard: ASRock FM2A88X Extreme4+ ATX FM2+ Motherboard ($88.98 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1600 Memory ($85.98 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Drive ($79.00 @ B&H)
Video Card: EVGA GeForce GTX 750 1GB Video Card ($99.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply: SeaSonic 400W 80+ Bronze Certified ATX Power Supply ($45.98 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.99 @ NCIX US)
Total: $609.40
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-02 08:12 EDT-0400)
 
Solution

Poprin

Honorable
Dec 13, 2012
720
0
11,360
Had a crack at a sub 500 build with that case:

PCPartPicker part list: http://pcpartpicker.com/p/XrMqhM

CPU: Intel Pentium G3220 3.0GHz Dual-Core Processor ($58.99 @ Amazon)
Motherboard: Gigabyte GA-B85M-D2V Micro ATX LGA1150 Motherboard ($49.33 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1600 Memory ($85.98 @ Newegg)
Storage: A-Data Premier Pro SP600 128GB 2.5" Solid State Drive ($64.99 @ TigerDirect)
Video Card: PowerColor Radeon R7 260X 1GB Video Card ($69.99 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply: Corsair Builder 430W 80+ Bronze Certified ATX Power Supply ($19.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.99 @ NCIX US)
Total: $479.25
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-06-02 08:13 EDT-0400)

If you can get that powercolor GPU at that reduced rate from newegg you would be laughing. Can't quite make the same build with AMD, but you could go with an Athlon x4 760k and an FM2 / FM2+ board.